POLLINATION M ost popular sweet cherry varieties are not self-fertile , cross-pollination is required between compatible varieties with the help of pollinators (e.g., honeybees). On the other hand, most sour or tart cherry varieties are self-fertile (e.g., North Star, Balaton, Meteor, Montmorency, English Morello, Early Richmond, Nanking, and Hansen Bush Cherry). Experienced cherry growers claim that bees are the best insects for this because they can facilitate the cross-pollination of cherry trees. Cross-fruitful (incompatible varieties) of sweet cherries are: Bing, Lambert, Royal Ann/Napoleon. Self-fruitful sweet cherry varieties (universal pollinator) are: Index, Lapins, Skeena, Sweetheart, Sonata, Symphony, Sunburst, BlackGold , WhiteGold , Stella, Van, Rainier, and Bing. Due to unsynchronised flowering, one pollinating variety usually doesn’t ensure cross-pollination. Therefore, it is always recommended to take blooming time into consideration and use two or even three pollinating varieties (usually one early flowering and one late flowering variety).